Hurricane Rotol mixture controls?

[reflected]

Normally it should be as Snapper said:

Lever back = Auto Rich (automatic)
Lever forward = lean (to use only with limited boost and RPM)

(Both on Hurricanes and Spits)

In game it's a mess. To figure out if it's actually lean or auto-rich, give full throttle and put the prop to fine pitch. If the plane starts shaking like hell then it's set to weak